510 algebraic ancient art boardbooks ceremonialbehavior christianartandsymbolism christianity christiansects classical communication communicationinsmallgroups conceptual crosses cycles decisionmaking des007040 des012000art015060art008000 design engineeringmathematics form(aesthetics) four(thenumber) geometricalmodels geometriikonsten geometry graphicarts groupdecisionmaking groupprocesses history illustration indians indiansofnorthamerica juvenileliterature liturgyandritual organizational orientation(religion) pi plane psychology reference religion(general) religiousaspects ritesandceremonies ritual russia(federation) shape shapes signsandsymbols socialsupport sphere square triangle visualcommunication